Two clathrates of bis(isothiocyanato)tetrakis(4-methylpyridine)magnesium(II) as a host with 4-methylpyridine as a guest |
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Authors: | J. Lipkowski D. V. Soldatov |
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Affiliation: | (1) Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44, 01 224 Warsaw, Poland |
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Abstract: | Two clathrate modifications of the title host with 4-methylpyridine (4-CH3C5H4N) as a guest have been determined at –50°C. [Mg(4-CH3C5H4N)4(NCS)2] · 2/3(4-CH3C5H4N) · 1/3H2O is trigonal, space group, witha=27.630(7),c=11.219(3) ÅV=7417(4) Å3,Z=9,Dcalc=1.171 g cm–3,(CuK)=18.506 cm–1, finalR=0.064. [Mg(4-CH3C5H4N)4(NCS)2] · (4-CH3C5H4N) is tetragonal, space group I4l/a, witha=16.944(7),c=23.552(9)Å,V=6762(5) Å,Z=8,Dcalc=1.191 g cm–3, (CuK)=18.200 cm–1, finalR=0.071.The structures consist of molecular packings of the same host complex units and the guest species. The Mg(II) cation is octahedrally coordinated to theN-atoms of four 4-methylpyridine and twotrans-coordinated isothiocyanato ligands in the host molecule. The conformations of the molecule are considerably different both in symmetry and in geometry in these two structures. The guest 4-methylpyridine molecules are disordered into channels which have different topology in these two clathrates resulting in different thermal stability. |
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Keywords: | Crystal structure clathrate Werner complex isothiocyanate 4-methylpyridine Mg(II) |
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